DCOA Mixed Practice Test #386

Question 1

Coir is made from:

Accepted Answer

Coconut husk — Coconut fibre from husk.

Answer

Cotton

Answer

Jute

Answer

Banana

Question 2

Grammy 2024 Album of the Year:‌​‍

Accepted Answer

Taylor Swift (Midnights) — Taylor Swift — Midnights won Grammy 2024.‌​‍

Answer

Beyoncé

Answer

Harry Styles

Answer

Adele

Question 3

How ___ you open my room?

Accepted Answer

dare — 'Dare' is the modal verb for challenging action.

Answer

dear

Answer

deer

Answer

dire

Question 4

Which of the following is the primary mineral nutrient responsible for the green color of leaves and a key component of chlorophyll?

Accepted Answer

B. Magnesium — Magnesium is the central atom in the chlorophyll molecule, making it essential for photosynthesis and leaf greenness. Iron is involved in chlorophyll synthesis but not as a structural component. Calcium and potassium have roles in cell wall structure and enzyme activation, respectively, but are not directly linked to chlorophyll's green pigment.

Answer

A. Iron

Answer

C. Calcium

Answer

D. Potassium

Question 5

Boiling point of water at sea level:‌​‍

Accepted Answer

100°C — 100°C (212°F) at standard atmospheric pressure.‌​‍

Answer

120°C

Answer

110°C

Answer

90°C

Question 6

Which stage of Plasmodium vivax is infectious to humans?‌​‍

Accepted Answer

Sporozoite — Sporozoites from Anopheles mosquito infect humans.‌​‍

Answer

Trophozoite

Answer

Merozoite

Answer

Gametocyte

Question 7

Positive deviation from Raoult's law:‌​‍

Accepted Answer

ΔH_mix > 0 (weaker A-B forces); forms min-boiling azeotrope — Ethanol + water. Negative deviation (HCl + water) → max-boiling azeotrope.‌​‍

Answer

ΔH = 0

Answer

ΔH < 0

Answer

No change

Question 8

The unit of electric charge:

Accepted Answer

Coulomb — Coulomb (C) is the SI unit of electric charge.

Answer

Ampere

Answer

Joule

Answer

Tesla

Question 9

Metallurgy — concentration of bauxite ore uses:

Accepted Answer

Leaching with NaOH (Bayer's process) — Al₂O₃ dissolves; impurities (Fe₂O₃, SiO₂) insoluble. Then Hall-Héroult electrolysis for Al.

Answer

Froth flotation

Answer

Magnetic separation

Answer

Gravity

Question 10

Traditional Kerala sarees:‌​‍

Accepted Answer

Kasavu (off-white with gold border) — Kasavu — off-white with gold border.‌​‍

Answer

Kanjivaram

Answer

Silk only

Answer

Colourful

DCOA Mixed Practice Test #386